quoting con quesa, Layperson, California:

Here's a potential phoneme inventory just to get that over with (all values IPA):
consonants:

pʼ pʰ b    tʼ tʰ d    tʃʼ  tʃʰ dʒ    kʼ kʰ ɡ
f              s            ʃ                x                h
w                          j
m            n                            ŋ
                            ɾ 

-voiced stops and fricatives merge intervocalically as voiced fricatives
- /w/ can sometimes be [ʋ] why not?
-ŋ can occur word-initially

Doesn't look much like Kabyle, but it looks good. Just let me Kabyle-ize it a little bit, adding [θ ð qʼ qʰ ħ ʕ].

Suggested romanization:

/pʼ pʰ b tʼ tʰ d tʃʼ  tʃʰ dʒ kʼ kʰ ɡ qʼ qʰ/ <p' p b t' t d c' c j k' k g q' q>
/f θ ð s ʃ x ħ ʕ h/ <f þ ð s S x H 3 h>
/w j/ <w y>
/m n ŋ/ <m n N>
/r/ <r>

The use of <H> is from Klingon and Arabic, <3> /ʕ/ is from Kabyle ɛ and Arabic, <N> is sometimes used for /ŋ/ when romanizing languages from India. Regarding /ʃ/ <S>... do we allow /sh/ to happen at all? If we don't we could simply use <sh>. I can type ŝ or ś or š easily, but I think of our mates on Windows 10...

Alternatively, /ʃ ħ ʕ ŋ/ <S H 3 N> can be written with the IPA symbols. We should agree on only using one set or the other when making the Annie dictionary though.

vowels:

ɪ  iː              ʊ  uː
ɛ eː              ɔ oː
æː              ɑ ɑː

-ɛ comes from a merger of older short /ɛ/ and /æ/, maybe this has morphological consequences

To Kabyle-ize this I'll just take out a bunch of vowels. What do you think of cutting the length distinction down to the Persian system?

The phonemes, with suggested romanization:

/i e æ ɑ o u/ <i e æ a o u>

We could kind of keep your idea about /ɛ/ by saying /æ/ is always unchecked (can only appear in open syllables), and if it gets morphologically checked then it becomes /e/ <e>. So if we have a singular-plural paradigm like sg. */kæbi/, pl. */kæbnu/, then we get /kæbi/ and /kebnu/.

Some random words:
yostí [jɔstiː]
mæneŋí [mæːnɛŋiː]
sobosru [sɔvɔsɾʊ]
áfak'  [ɑːvɑkʼ]
wek'né  [wɛkʼneː]

yosti [josti]
mæneNi [mæneŋi]
sobosru [sovosru]
afak' [ɑvɑkʼ]
wek'ne [wekʼne]


Meanwhile:

<Slereah> Oh god
<Slereah> I just noticed that I sparked the collablang
<Slereah> What have I done